Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing, 100083, P. R. China.
School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore.
Adv Sci (Weinh). 2023 May;10(14):e2300094. doi: 10.1002/advs.202300094. Epub 2023 Mar 22.
High catalytic efficiency and long-term stability are two main components for the performance assessment of an electrocatalyst. Previous attention has been paid more to efficiency other than stability. The present work is focused on the study of the stability processed on the FeCoNiRu high-entropy alloy (HEA) in correlation with its catalytic efficiency. This catalyst has demonstrated not only performing the simultaneous hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) with high efficiency but also sustaining long-term stability upon HER and OER. The study reveals that the outstanding stability is attributed to the spinel oxide surface layer developed during evolution reactions. The spinel structure preserves the active sites that are inherited from the HEA's intrinsic structure. This work will provide an insightful direction/pathway for the design and manufacturing activities of other metallic electrocatalysts and a benchmark for the assessment of their efficiency-stability relationship.
高催化效率和长期稳定性是评估电催化剂性能的两个主要因素。以前的研究更多地关注效率而不是稳定性。本工作重点研究了与催化效率相关的 FeCoNiRu 高熵合金（HEA）的稳定性过程。该催化剂不仅表现出高效的析氢反应（HER）和析氧反应（OER）的协同作用，而且在 HER 和 OER 过程中还具有长期的稳定性。研究表明，出色的稳定性归因于在演化反应过程中形成的尖晶石氧化物表面层。尖晶石结构保留了源自 HEA 固有结构的活性位。这项工作将为其他金属电催化剂的设计和制造活动提供一个有见地的方向/途径，并为评估它们的效率-稳定性关系提供一个基准。
